I should be able to delete myself from Querki
Summary: We don't currently have a way to remove yourself from the system. In the modern world of GDPR, we clearly need to add that.
This necessarily includes deleting all of your Spaces. (Since otherwise they would be left orphaned and ownerless, and that's not okay.) Ideally, we should offer a way to transfer ownership of those Spaces before removing yourself. Note that there is a possible race condition where I offer a transfer and immediately remove myself; we need to deal with Spaces in this halfway state.
